Question

Galileo was the first scientist to do which of the following? A. estimate the speed of light B. propose the heliocentric theory C. discover radioactivity D. define and measure speed E. invent the reflecting telescope

Answer 1

Galileo Galilei was the first scientist to perform experiments in order to test his ideas. He was also the first astronomer to systematically observe the skies with a telescope.

:)

Answer 2

Galileo was the first scientist to invent the reflecting telescope

Step-by-step explanation:

Galileo was very concerned with astronomy and he made his own telescope to observe stars and heavenly objects. He used his newly invented telescope to discover four of the moons circling Jupiter, to study Saturn, to observe the phases of Venus, and to study sunspots on the Sun. His achievements include improvements to the telescope and consequent astronomical observations, and support for Copernicanism.